Precise probing spin wave mode frequencies in the vortex state of circular magnetic dots

Details Precise probing spin wave mode frequencies in the vortex state of circular magnetic dots Precise probing spin wave mode frequencies in the vortex state of circular magnetic dots

2010-01-20

arxiv.org/abs/1001.3605v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1063/1.3268453

We report on detailed broadband ferromagnetic resonance measurements of azimuthal and radial spin wave excitations in circular Permalloy dots in the vortex ground state. Dots with aspect ratio (Beta =height over radius) varied from 0.03 to 0.1 were explored. We found that for Beta exceeding approximately 0.05, variation of the spin wave eigenfrequencies with Beta deviates from the predicted dependence. The frequency splitting of two lowest azimuthal modes was observed. The experimentally observed dependence of the frequency splitting on beta was reasonably well described by dynamic splitting model accounting the spin-waves and, vortex gyrotropic mode interaction.

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